00656naa#a2200217#i#450# EN\\bibl\114019 20260319001029.4 3034-4689 20260128b2026####ek#y0engy0150####ca RU UPGRADING OF HEAVY HIGH-VISCOSITY OIL IN THE PRESENCE OF KAOLIN, NICKEL OXIDE, AND POLYOLEFINS Journal article Kazan Kazan National Research Technological University 2026 5 с. Journal article local Shayhutdinov B. A. Antonova Marina Yur'evna Prokof'eva L. S. Zayceva E. G. vestniktu.ru